Pump



May 26, 1953 D. H. BIERMAN ETAL Filed April 27, 1948 8 Q@ .30 l /08 /Z Hlll INVENTORS i FM.; LMU

Patented May 26, 1953 PUMP Daniel H. Bierman, Malverne, `and Joseph A. J awett, Jamaica, N. Y., assignors to Liquidepth Indicators Incorporated, Long Island City,

N. Y., a corporation Application April 27, 1948, Serial N o. 23,574

This invention relates to pumps, and more especially, though not exclusively, to .pumps for injecting a gaseous medium into a liquid container.

It is the primary object of the present invention to provide a pump of this type. which may permanently be mounted ona liquid container and applied instantaneously for the injection into the latter of a gaseous medium, such as air, without at any time admitting to the working parts of the pump any liquid from the container even when the latter is lled to capacity.

In this connection, it is an important object of the present invention to make provisions in the pump for automatically blocking the now of liquid into the latter whenever the liquid level rises to the pump, without interfering with the normal performance of the pump to force compressed air into the liquid container.

In the same connection, it is another important object of the present invention to provide in the pump a plug which may at any time be applied, when the pump is not in operation, not only for the purpose of blocking the flow of liquid from the container into the pump, but also for the purpose of hermetically sealing the liquid container from the pump.

It is another object of the present invention to provide a pump of this type which is eicient in operation over a long period of time, and which consists of a minimum number of simple and inexpensive parts that do not require overly close tolerances and may readily be assembled without requiring much skill,

The above and other objects, features and advantages of the present invention will be more fully understood from the following description considered in connection with the accompanying illustrative drawings.

In the drawings:

Fig. 1 is an elevational view, partly in section, of a pump embodying the present invention;

Fig. 2 is a longitudinal section through the pump; and

Fig. 3 is another sectional view, partly in elevation, of the pump in a different position.

Referring to the drawings, the reference numeral I designates a pump which comprises a cylinder I2 having an open end I4,. and a piston I6 which extends into the cylinder I2 and has some clearance from the adjacent cylinder Wall I8. The cylinder I2 consists, in the Ipresent instance, of a cylinder shell 22 and an end member which may be press-fitted into the shell 22 and secured therein by the adjacent inwal'dly 12 Claims. (Cl. 222-402) crimped end 24 of the latter. The end member 20 may additionally be secured to the cylinder shell 22 in any suitable manner, as by brazing, for instance. The end member 20 is provided f, with an inwardly projecting shank 26 having a diametrically reduced plug extension 28. The

end member 20 is further provided with an inletpassage 30 which extends into the shank 26 and communicates with the interior ofthe cylinder through lateral branches 30' (Fig. 2). Conveniently threaded into the inlet passage 30 is an orificed valve member 36 having a seat. 38` for a check valve 40 in the inlet .passage 30. The

check valve 48 may be in the form of a ball, and

the valve seat 38 in the member 36 is conveniently made conical for uniform seatingengagement with the ball check 40 when a fluid charge in the interior ofthe cylinder is being compressed.

Preferably, there is provided in the cylinder I2 a pre-loaded compressionspring 44 which normally urges thercylinder I2 and piston I6 into the maximum expanded relative position shown in Fig. v2, in which a stop collar 46 in the open end I4 of the cylinder I2 is engaged by an annular shoulder 48 on the piston I6. The stop collar.

46 may conveniently besecured in the cylinderl I2 by inwardly crimping the adjacent end of the cylinder shell 22 as at 50.

. The .piston I6 is provided with a peripheral. l. groove 52 of preferably rectangular cross section, vin which is received a piston ring 54. The piston ring 54 is, lin the present instance, preferably made of resilient material, such as rubber or ar rubber-like substance, sothat it may be drawn over the adjacent end of the 'piston I6 for itsk insertion into the groove 52 therein. The piston ring 54 is preferably U-shaped in cross section, with the inner rim 56 bearing against the bottom of the groove 52 and the outer rim 58 bearing against the cylinder wall I8. As shown in Fig. 2, the U ofthe piston ring 54 is open toward the interior of thecylinder, so that an air charge,

for instance, in the cylinder will, on being com-v pressed, force the inner and outer rims 56 and 58, respectively, of the piston ring 54 apart, i. e.,

groove 52 andthe cylinderwall I8, respectively. A very effective sealagainst the escape of the compressed air charge from the cylinder past the' piston I6 is thus provided.

The piston I6 is provided ywith an outlet lpassage 64y which is part-way threaded as at 66 for a purpose hereinafter described. The outer end of the outlet Ipassage 64 is provided with a prefenably frusto-conical recessv 68 for the reception i of an hydraulic packing ring 'I0 of any suitable material. The packing ring serves as a seat for a oat valve I2 in a float chamber 14. The float chamber 'I4 is provided in a cap 15 that may conveniently be screwed at I8 over the adjacent reduced end *I9 of the piston I6, there being preferably interposed between the latter and the cap 1B a gasket 8B. The cap 1S is provided with an outlet duct 82 Which is in communication with the float chamber 'I4 and extends through a pluglike projection 84 on the cap 16. The plug-like projection 84 may be externally threaded for its convenient attachment to any suitable container 88 that may hold any kind of liquidL l(Fl'i'g. 1). Preferably, there is interposed a-gasket 90 between the container 88 and the cap 'IE of the pump I0.

The oat valve 'I2 is, in the present instance, in the form of a cylindrical core 92 of cork or any other suitable buoyant material, and the same is preferably peripherally harnessed by a metal sleeve M. The core 92 of the 'float valve 'l2 has a projecting valve stem .I GII-.Which is Vpreierably conical in Ishape and extends into the valve seat l@ in any position of the float valve. The valve stem I 0G is preferablyaseparate :metallic part, having a shank 98 inserted in the valve core Q2 for its sec-ure mounting on the latter. The bottom end of the valve core 92 is preferably notched as -at I 0 2 4to `provide communication between the float chamber I4 and the outlet duct 32 when the oat valve 72 is seated at the bottom I0@ of the float chamber as show-n in Fig. l2. In `using the mounted :pum-p Hl, the cylinder vI2 thereof is conveniently yusedas a -handle. Thus, o n a downward stroke of the cylinder I2, the duid-charge therein, in the present instance air, is forced through the outletpassage 611, oat chamber 14 and outlet duct 82 into -`the lliquid container 88, the check valve 40 then preventing the escape of air from Athe Acylinder I2 lthrough the .inlet passage 3D., as will be readily understood. For the successful operation .ofthe pump I0, the container 88 mustbe filled with liquid at least 11p to, .or .nearly to, the ,outlet duct 82 of the pump, ,and ,the container must 'be so shaped as to permit the forced-in air to'segregate above the .liquid level thereingso vthat liquid vr separates the pump I Il from any `air -in the container. 'In the case -Where the liquid 'level Vin a Vcontainer is below the outlet `duct 8 2 0f ,the mounted `pump Il) thereon, recourse may .be had lto the Wellknown expediency ,of extending a tube (not shown) from the outlet `duct 8 2 into the liquid thereby blocking .the air in vthe container from the pump.

Thus, on repeated .downward strokes, of the cylinder 2 of the pump, successive .air charges are forced in to the container. IShould the level of the liquid rise -to or,s l ght1y above the point shown in 1, the .float .valve J2 .will ,become seated on the packing .ring .'I.Il, so that the liquid may not .enter .the interior of the Cylinder and render the same liquid-bound, i. e. inoperative for ,its assigned tunctionof forcing air into the container 83. Of course, ,even if 'the .float valve 'E2 is closed las in Fig. v1, the pump is still .operativeand will, Ion operation, force air into the container 88 past the float valve .12, as will be readily understood. Thus, the Ainstant Dump will perform satisfactorily as long as the liquid level in any container, on which the pump maybe mounted, Will not rise substantially 'above' the -level shown 111.Fg. 1.

If the pump 'In is not needed for any length 4 of time, the same may be sealed completely from the liquid container 88. To this end, the plug extension 23 on the shank 25 in the cylinder I2 is threaded as at |06 so as to be screwable into the threaded end BS of the outlet passage 64 as shown in Fig. 3. The cylinder I2 is for that purpose depressed and then turned until a gasket I 08 around the plug extension v28 becomes rmly vseated on the adjacent bottom surface Il of a counterbore II2 in the piston IB. To release the pump for operation, it is merely necessary to turn the cylinder in the opposite direction so Aas to-unscrew the plugextension 28 from the outlet passage 54, as Wlll be readily understood.

While I have .shown and described the preferred embodiments of my invention, it Will be understood that :various changes may be made in the present invention without departing from the underlying idea or principles of the invention within the scope of the appended claims.

Having thus vdescribed .our invention, what we claim .and desire -to secure by Letters Patent vis:

l. A pump for injecting .a gaseous medium into' a liquid container, comprising a cylinder memberV with an .open end, a piston member extending through the open end of, .and slidably received in, said cylinder .member .to Vform therein Aa Ycom.- pression chamber, ysaid members having an .inlet passage into, andan outlet `passage from, said compressioncharnber, 1espectively,fof which said outlet passage is :provided with a valve seat inf termediate its ends, means foropening .and closing said linlet passage, said Amean-s comprising a check valve in said inlet vpassage yclos-ing the latter on .compression of a `duid charge in saidchamber `and a iloat -valve in said outlet passage adapted to become seated .on said valve seat fby liquid entering saidoutlet passage from fthe-outer end thereof.

y2. A pump Yas set forth inlclaim 1, further {coinprising a vcompression spring -in said chamber' urgingsaid members apart vone 'end of said com.-

pression spring bearing 'against said cylinder member and the opposite end-of said spring bearing against said piston member, and cooperating stop means lon said members limiting the springurged movement of said members :apart from each other.

3. A pump as set forth in claim 1, in which said valve seat is a hydraulic vpacking ring peripherally mounted in said outlet pasage, and ysaid oat -valve is providedwith a conical stem projecting into said packing ring.

4. A pump, comprising a cylinder with an open end, a piston extend-ing through the open 'end of, and slidably received in, said cylinder to formkj4 therein a compression chamber, said cylinder and piston having an inlet passagel into, and an outvalve seat is a circular hydraulic packingring peripherally mounted in said outer end of lthe outlet passage, and said iioat val-ve comprises a buoyant body provided (with a conical projection extending i-n-to said packing ring. i

6. A pump as set forth in claim a, in which said float chamber is substantially cylindrical with said valve seat disposed axially thereof, said valve seat is a hydraulic packing ring peripherally mounted in said outer end of the outlet passage, and said float valve comprises a substantially cylindrical cork plug, a metal harness carried by, and surrounding the periphery of, said plug, and a conical valve stem carried by said plug and projecting axially therefrom, said valve stem extending into said packing ring.

7. A pump as set forth in claim 4, in which said cap is provided with a threaded projecting shank through which said outlet duct extends and which is adapted for removably mounting said pump on a complementary threaded container.

8. A pump for injecting a gaseous medium into a liquid container, comprising a cylinder member with an open end, a cylindrical piston member extending through the open end of, and slidably as well as turnably received in, said cylinder member to form therein a compression chamber, one of said members having an inlet passage into, and the other member having an outlet passage from, said compression chamber of which said outlet passage is providedwth a valve seat intermediate its ends, rst means for opening and closing said inlet passage, a float valve in said outlet passage adapted to become seated on said valve seat by liquid entering said outlet passage from the outer end thereof, and second complementary threaded means provided by the adjacentends of said members and cooperating to seal said outlet passage from, and open it to, said compression chamber on relative rotation between said members in opposite directions, respectively, when the latter are in their innermost relative position.

9. A pump as set forth in claim 8, in which said outlet passage extends axially of Said other member, and said second means comprises threads in the inner end of said outlet passage, and a threaded plug carried by said one member and projecting axially inwardly of the latter, said plug being in axial alignment with, and threadedly receivable by, said threaded inner end of the outlet passage.

10. A pump as set forth in claim 8, in which said outlet passage extends axially of said other member, said second means comprises threads in the inner end of said outlet passage, and a shank with a threaded plug extension carried by said one member and projecting axially inwardly of the latter, said plug extension being in axial alignment with, and threadedly receivable by, said threaded inner en'd of the outlet passage, said inlet passage extending through said shank and leading from the latter into said compression chamber remote from said plug extension, and having a valve seat intermediate its ends, and said iirst means comprises a check valve in said inlet passage adapted to become seated on the last mentioned valve seat on compression of a Iiuid charge in said compression chamber.

11. A pump for injecting a gaseous medium into a liquid container, comprising a cylinder member with an open end, a cylindrical piston member extending through the open end of, and slidably as Well as turnably received in, said cylinder member to form therein a compression chamber, one of said members having an inlet passage into, and the other member having an outlet passage from, said compression chamber, rst valve means for opening and closing said inlet passage, and second means provided by said members and cooperating to seal said outlet passage from, and open it to, said compression chamber on relative rotation between said members in opposite directions, respectively, when the latter are in their innermost relative position, said second means comprising a threaded plug carried by said one member and complementary threads in the inner end of said outlet passage.

l2. A pump as set forth in claim 11, in Which said outlet passage extends axially of said other member, and said second means comprises threads in the inner end of said outlet passage, and a threadedplug carried by said one member and projecting axially inwardly of the latter, said plug being in axial alignment with, and threadedly receivable by, said threaded inner end of the outlet passage.

DANIEL H. BIERMAN.y JOSEPH A. JAWETT.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 32,881 Lewis July 23, 1861 1,170,756 Kelley Feb. 8, 1916 2,175,947 Teeple Oct. 10. 1939 2,293,564 Schnell Apr. 29, 1940 FOREIGN PATENTS Number Country Date 3,638 Great Britain of 19H0 

